Last Tuesday we caught the train to Paris, but instead of catching the TGV we went the "touristic" route, through Amboise, Onzain, Blois and Orleans. It's a lot longer journey (2½ hours compared to 55 minutes) but has the advantage of scenery: the TGV just crosses mile after mile of flat plain dotted with wind turbines, the slow train follows the course of the Loire to Orleans.
Between Orleans and Paris the train travels alongside something strange - a long concrete viaduct. This is all that remains of Aerotrain, an experiment in hovertrains that ran from 1965 to 1977.
construct the A19. Here is the break in the line.